Leakage-proof gate valve and sealing assembly thereof

Abstract

The invention relates to the technical field of valves, in particular to an anti-leakage gate valve and a sealing assembly thereof, the sealing assembly comprises a mounting ring, a rigid sealing ring and a first driving assembly, a medium channel is formed in a valve body, a gate plate is arranged in the medium channel in a sliding mode, the gate plate or closes the medium channel, and a valve rod is connected to the valve body. One end of the valve rod is located outside the valve body. The mounting ring and the first driving assembly are arranged, when a rigid sealing ring needs to be replaced, a worker pokes a rotating disc with hands, and through transmission cooperation of a transmission rod, a transmission gear, a transmission gear ring, a tray and a transmission unit, the rigid sealing ring can move in a ring groove along the axis of the ring groove; therefore, the rigid sealing rings on the outermost sides of the two annular grooves can be switched, and due to the fact that workers do not need to disassemble the valve body in the process of replacing the rigid sealing rings, the workload of the workers can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to an anti-leakage gate valve and a sealing component thereof. Background Art

[0002] A gate valve is a common valve used primarily for controlling fluid flow in pipeline systems. It opens and closes a channel by controlling a gate disc positioned perpendicular to the flow direction. The main components of a gate valve include a valve body, bonnet, gate disc, stem, and handwheel. The valve body contains a channel for the medium to flow, and the gate disc, driven by the valve stem, moves up and down to open and close this channel.

[0003] However, existing gate valves have the following problems: under the continuous scouring effect of the fluid medium, the service life of the sealing ring will be significantly reduced, so the sealing ring needs to be replaced frequently, which will shorten the maintenance cycle of the gate valve and increase the workload of maintenance personnel. Summary of the Invention

[0004] Based on this, it is necessary to provide a leakage-proof gate valve and its sealing assembly to address the problems existing in the current gate valve, so as to solve the problem of heavy workload for maintenance personnel caused by frequent replacement of sealing rings.

[0005] The above purpose is achieved through the following technical solutions: A sealing assembly for an anti-leakage gate valve, used for the anti-leakage gate valve, the anti-leakage gate valve comprising a valve body with a medium channel opened inside; A gate, slidingly disposed in the medium channel, for opening or closing the medium channel; The valve stem is connected to the valve body, with one end of the valve stem located outside the valve body and the other end located inside the medium channel. The end of the valve stem located in the medium channel is connected to the gate, and the valve stem can drive the gate to move along the axis of the valve stem; The sealing assembly comprises: There are two mounting rings, one of which is located inside the peripheral wall of the valve body and the other is located on the side wall of the gate. An annular groove is provided on the end surfaces of the two mounting rings facing each other. When the medium channel is closed, the two annular grooves enclose an annular closed chamber. There are multiple rigid sealing rings, which are stacked in sequence in the ring groove along the axis of the ring groove; The first drive assembly is arranged on the valve body, and is used to drive multiple rigid sealing rings to move synchronously along the axis of the ring groove; and when the two ring grooves enclose an annular closed chamber, the first drive assembly causes the rigid sealing rings in the ring groove to move sequentially along the axis of the slide groove.

[0006] Preferably, the first driving assembly includes a rotating disk, a transmission rod, a transmission gear, a transmission gear ring and a tray, the transmission rod is rotatably arranged on the valve body, one end of the transmission rod is located outside the valve body, and the other end is located inside the valve body, the rotating disk is fixedly connected to the end of the transmission rod located outside the valve body, the transmission gear is located inside the valve body, and the transmission gear is coaxially arranged on the transmission rod, the transmission gear ring is rotatably arranged inside the valve body, the transmission gear ring is meshed with the transmission gear, and the transmission gear ring is coaxial with the mounting ring, the tray is threadedly connected to the innermost side of the ring groove, and the tray abuts against the innermost rigid sealing ring; The tray and the transmission gear ring are connected via a transmission unit, and the transmission unit is configured so that the tray and the transmission gear ring can rotate synchronously around the axis of the tray and move relatively along the axis of the tray.

[0007] Preferably, the transmission unit includes a synchronization rod and a synchronization hole, wherein there are multiple synchronization rods, which are circumferentially evenly spaced on the end face of the tray away from the rigid sealing ring, and there are multiple synchronization holes, which are circumferentially evenly spaced on the end face of the transmission gear ring close to the mounting ring; A plurality of arc grooves are formed on the bottom of the mounting ring, and the plurality of arc grooves correspond to the plurality of synchronization rods one by one. The plurality of synchronization rods slide through the corresponding arc grooves and are inserted into the synchronization holes.

[0008] Preferably, a soft sealing sheet and a hard sealing sheet are embedded in the end faces of both ends of the rigid sealing ring respectively, and the end faces of two adjacent rigid sealing rings facing each other are made of the same material type.

[0009] Preferably, both end faces of the rigid sealing ring are inclined, and the degree of inclination of the end faces of the rigid sealing ring increases from inside to outside along the axis of the ring groove.

[0010] Preferably, a pointer is provided on the outer peripheral wall of the rotating disk, and a scale disk is provided outside the valve body and in the circumferential direction of the rotating disk.

[0011] Preferably, a second drive assembly is provided between the mounting ring and the valve stem, and the second drive assembly is used to drive the second drive assembly to rotate around its own axis when the valve stem rotates clockwise around its axis.

[0012] Preferably, the second drive assembly includes an upper conical gear ring and a lower conical gear ring, both of which are sleeved on the outside of the valve stem, and both of which cooperate with the valve stem for one-way transmission, and are configured so that when the valve stem rotates clockwise, the lower conical gear ring rotates synchronously with the valve stem, and when the valve stem rotates counterclockwise, the lower conical gear ring rotates relative to the valve stem; The upper conical gear ring and the lower conical gear ring are spaced apart from each other, and the upper conical gear ring is arranged in the gate plate. The upper conical gear ring and the gate plate can move synchronously along the axis of the valve stem, and the upper conical gear ring is engaged with the annular conical gear groove on the inner circumference of the mounting ring corresponding to the gate plate. The lower conical gear ring is arranged at the lower part of the medium channel, and the lower conical gear ring is engaged with the annular conical gear groove on the inner circumference of the mounting ring corresponding to the valve body.

[0013] Preferably, the gate plate and the valve stem are threadedly connected, and a guide block is provided on the side of the gate plate. A guide groove is provided in the medium channel, the guide groove extends along the axis of the valve stem, and the guide groove and the guide block are slidably matched.

[0014] A leakage-proof gate valve uses the sealing component of the leakage-proof gate valve.

[0015] The beneficial effects of the present invention are: The present invention is provided with an installation ring and a first drive assembly. When the rigid sealing ring needs to be replaced, the staff manually turns the rotating disk, and through the transmission cooperation of the transmission rod, transmission gear, transmission gear ring, tray and transmission unit, the rigid sealing ring can be moved in the ring groove along the axis of the ring groove, thereby allowing the rigid sealing rings on the outermost sides of the two ring grooves to be switched. Since the staff does not need to disassemble the valve body during the replacement of the rigid sealing ring, the workload of the staff can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of an anti-leakage gate valve of the present invention; Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle; Figure 3 This is a top view of an anti-leakage gate valve of the present invention; Figure 4 for Figure 3 Middle BB cross-section; Figure 5 for Figure 4 Schematic diagram of the enlarged structure at C in the middle; Figure 6 This is a structural schematic diagram of a gate plate in an anti-leakage gate valve of the present invention; Figure 7 for Figure 6 Schematic diagram of the enlarged structure at D in the middle; Figure 8 This is a schematic structural diagram of a rigid sealing ring in a leakage-proof gate valve of the present invention; Figure 9 for Figure 8 Schematic diagram of the enlarged structure at E in the middle; Figure 10 This is a schematic structural diagram of an upper conical gear ring in an anti-leakage gate valve of the present invention; Figure 11 This is a structural schematic diagram of a valve stem in an anti-leakage gate valve of the present invention; Figure 12 This is a schematic structural diagram of an arc groove in an anti-leakage gate valve of the present invention; Figure 13 This is a schematic diagram of a state in which the medium channel of an anti-leakage gate valve of the present invention is open.

[0017] in: 100, valve body; 110, medium channel; 120, dial; 200, gate; 210, guide block; 220, slot; 300, valve stem; 400, mounting ring; 410, ring groove; 420, arc groove; 500, rigid sealing ring; 510, synchronization groove; 520, synchronization protrusion; 600, first drive assembly; 610, rotating disk; 611, pointer; 620, transmission rod; 630, transmission gear; 640, transmission gear ring; 650, tray; 700, second drive assembly; 710, upper conical gear ring; 720, lower conical gear ring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0021] like Figures 1 to 13 As shown, a sealing assembly of a leakage-proof gate valve is used for a leakage-proof gate valve. The leakage-proof gate valve includes a valve body 100, a gate plate 200 and a valve stem 300. A medium channel 110 is opened inside the valve body 100, and the gate plate 200 is slidably arranged in the medium channel 110. The gate plate 200 is used to open or close the medium channel 110. The valve stem 300 is connected to the valve body 100, one end of the valve stem 300 is located outside the valve body 100, and the other end of the valve stem 300 is located inside the medium channel 110, and the end of the valve stem 300 located in the medium channel 110 is connected to the gate plate 200. The valve stem 300 can drive the gate plate 200 to move along the axis of the valve stem 300. The sealing assembly includes a mounting ring 400, a rigid sealing ring 500 and a first drive assembly 600. There are two mounting rings 400. , one of which is arranged in the peripheral wall of the valve body 100, and the other is arranged on the side wall of the gate 200, the two mounting rings 400 are coaxial, and annular grooves 410 are opened on the end surfaces of the two mounting rings 400 facing each other. There are multiple rigid sealing rings 500, and multiple rigid sealing rings 500 are stacked in sequence in the annular groove 410 along the axis of the annular groove 410. The first driving assembly 600 is arranged on the valve body 100, and the first driving assembly 600 is used to drive the multiple rigid sealing rings 500 to move synchronously along the axis of the annular groove 410. When the medium channel 110 is closed, the two annular grooves 410 enclose an annular closed chamber. At this time, the first driving assembly 600 drives the rigid sealing ring 500 to move along the axis of the annular groove 410 to switch the outermost rigid sealing ring 500 of the annular groove 410.

[0022] In the initial state, a plurality of rigid sealing rings 500 are stacked in the annular groove 410 corresponding to the valve body 100 , and one rigid sealing ring 500 is placed in the annular groove 410 corresponding to the gate plate 200 .

[0023] When the medium channel 110 is closed, Figure 4 As shown, the outermost rigid sealing ring 500 among the multiple rigid sealing rings 500 stacked in the annular groove 410 corresponding to the valve body 100 is tightly fitted with the outermost rigid sealing ring 500 in the annular groove 410 corresponding to the gate plate 200, thereby achieving sealing of the medium channel 110.

[0024] When the medium channel 110 is open, Figure 13 As shown, the gate plate 200 moves to the upper part of the medium channel 110. The gate plate 200 no longer seals the medium channel 110, so the fluid medium can flow from the liquid inlet to the liquid outlet of the gate valve through the medium channel 110. During the process of the fluid medium flowing through the medium channel 110, the rigid sealing ring 500 located on the outermost side of the multiple rigid sealing rings 500 stacked in the annular groove 410 corresponding to the valve body 100, and the end faces of the rigid sealing ring 500 on the outermost side of the annular groove 410 corresponding to the gate plate 200, which face each other, are in direct contact with the fluid medium. During the flow of the fluid medium, the fluid medium continuously scours the end faces of the rigid sealing ring 500 that are in direct contact with the fluid medium, so the wear of the end faces of the rigid sealing ring 500 that are in direct contact with the fluid medium gradually increases.

[0025] It should be noted that, in order for the valve stem 300 to drive the gate plate 200 to move along the axis of the valve stem 300, the following two connection methods can be used: the first method: the valve stem 300 is rotatably connected to the valve body 100, the valve stem 300 passes through the gate plate 200 and is threadedly connected to the gate plate 200; the second method: the valve stem 300 is threadedly connected to the valve body 100, the lower end of the valve stem 300 is inserted into the gate plate 200, and the valve stem 300 and the gate plate 200 are configured to move synchronously and rotate relative to each other. In addition, in order to guide the gate plate 200, a guide block 210 is provided on the side of the gate plate 200, and a guide groove is provided in the medium channel 110. The guide groove extends along the axis of the valve stem 300 and the guide groove and the guide block 210 are slidably engaged.

[0026] When the medium channel 110 needs to be switched from an open state to a closed state (clockwise rotation is set to open the valve, counterclockwise rotation is set to close the valve), taking the first connection method between the valve stem 300 and the gate plate 200 as an example, the staff rotates the valve stem 300 counterclockwise. Due to the threaded connection between the valve stem 300 and the gate plate 200, the valve stem 300 drives the gate plate 200 to move synchronously under the limiting action of the guide block 210 and the guide groove. As the valve stem 300 continues to rotate, the gate plate 200 gradually moves downward and completely blocks the medium channel 110. At this time, the outermost rigid sealing ring 500 of the multiple rigid sealing rings 500 placed in the annular groove 410 corresponding to the valve body 100 and the outermost rigid sealing ring 500 of the rigid sealing rings 500 placed in the annular groove 410 corresponding to the gate plate 200 are tightly fitted. At this time, the medium channel 110 is switched from an open state to a closed state. When the medium channel 110 needs to be switched from a closed state to an open state, the valve stem 300 is simply rotated clockwise, and the specific process will not be described in detail.

[0027] When the medium channel 110 needs to be switched from an open state to a closed state (clockwise rotation is set to open the valve, counterclockwise rotation is set to close the valve), taking the second connection mode between the valve stem 300 and the gate plate 200 as an example, the staff rotates the valve stem 300 counterclockwise. Since the valve stem 300 is threadedly connected to the valve body 100, the valve stem 300 rotates counterclockwise around its own axis and moves along its own axis toward the medium channel 110. Since the valve stem 300 and the gate plate 200 are configured to be able to rotate relative to each other and simultaneously The valve stem 300 moves synchronously, so the gate plate 200 moves synchronously. As the valve stem 300 continues to rotate, the gate plate 200 gradually moves downward and completely blocks the medium channel 110. At this time, the outermost rigid sealing ring 500 of the multiple rigid sealing rings 500 placed in the annular groove 410 corresponding to the valve body 100 and the outermost rigid sealing ring 500 of the rigid sealing rings 500 placed in the annular groove 410 corresponding to the gate plate 200 are tightly fitted. At this time, the medium channel 110 is switched from an open state to a closed state. When the medium channel 110 needs to be switched from a closed state to an open state, the valve stem 300 is rotated clockwise. The specific process is not repeated here.

[0028] like Figure 5 As shown, when the service life of the rigid sealing ring 500 reaches the preset time limit or the gate valve is detected to start leaking, the rigid sealing ring 500 needs to be replaced. At this time, the staff first rotates the valve stem 300 counterclockwise to close the medium channel 110. After the medium channel 110 is closed, the staff starts the first drive assembly 600. At this time, the first drive assembly 600 drives the multiple rigid sealing rings 500 stacked in the annular groove 410 corresponding to the valve body 100 to move synchronously along the axis of the annular groove 410 by a preset distance (the preset distance is equal to the thickness of one rigid sealing ring 500). At this time, the number of rigid sealing rings 500 in the annular groove 410 corresponding to the gate plate 200 increases by one, and the number of rigid sealing rings 500 in the annular groove 410 corresponding to the valve body 100 increases by one. The number of rigid sealing rings 500 is reduced by one, so that the rigid sealing rings 500 on the outermost sides of the two ring grooves 410 can be switched. At this time, the sealing surfaces of the rigid sealing rings 500 on the outermost sides of the two ring grooves 410 are sealing surfaces that have not been eroded and worn by the fluid medium. Therefore, when the medium channel 110 is opened again, the rigid sealing rings 500 on the outermost sides of the ring groove 410 corresponding to the valve body 100 and the rigid sealing rings 500 on the outermost sides of the ring groove 410 corresponding to the gate plate 200 are both in direct contact with the fluid medium for the first time, thus completing the replacement of the rigid sealing rings 500. Since the staff does not need to disassemble the valve body 100 during the replacement of the rigid sealing rings 500, the workload of the staff can be greatly reduced.

[0029] It should be added that in order to ensure the sealing performance of the rigid sealing ring 500 and prevent the rigid sealing ring 500 from moving along the axis of the annular groove 410 under the pressure of the fluid medium, specifically, the rigid sealing ring 500 should be threadedly connected to the inner circumferential wall of the annular groove 410. In this way, under the self-locking effect of the thread, the rigid sealing ring 500 can be prevented from moving along the axis of the annular groove 410 under the pressure of the fluid medium.

[0030] It should also be added that in order to enable the multiple rigid sealing rings 500 in the closed chamber to rotate synchronously, specifically, a synchronization groove 510 can be eccentrically set at one end of the rigid sealing ring 500, and a corresponding synchronization protrusion 520 can be eccentrically set at the other end of the rigid sealing ring 500. In this way, the two adjacent rigid sealing rings 500 are fastened and connected to each other through the synchronization groove 510 and the synchronization protrusion 520, and the stacked rigid sealing rings 500 can rotate synchronously.

[0031] In this embodiment, if Figure 4 and Figure 5 As shown, the first drive assembly 600 includes a rotating disk 610, a transmission rod 620, a transmission gear 630, a transmission gear ring 640 and a tray 650. The transmission rod 620 is rotatably arranged on the valve body 100. One end of the transmission rod 620 is located outside the valve body 100, and the other end is located inside the valve body 100. The rotating disk 610 is fixedly connected to the end of the transmission rod 620 located outside the valve body 100. The transmission gear 630 is located inside the valve body 100 and is coaxially arranged on the transmission rod 620. The transmission gear ring 640 is rotatably arranged inside the valve body 100, the transmission gear ring 640 is engaged with the transmission gear 630, the transmission gear ring 640 is coaxial with the mounting ring 400, the tray 650 is threadedly connected to the innermost side of the ring groove 410, and the tray 650 is abutted against the innermost rigid sealing ring 500, the tray 650 and the transmission gear ring 640 are connected through a transmission unit, and the transmission unit is configured so that the tray 650 and the transmission gear ring 640 can rotate synchronously around the axis of the tray 650 and move relative to each other along the axis of the tray 650.

[0032] When the rigid sealing ring 500 needs to be replaced, the staff manually moves the rotating disk 610 so that the rotating disk 610 rotates a preset angle. At this time, the rotating disk 610 drives the transmission rod 620 to rotate the preset angle synchronously. The transmission rod 620 drives the transmission gear 630 to rotate synchronously. The transmission gear 630 drives the transmission gear ring 640 to rotate the preset angle through meshing. The transmission gear ring 640 drives the tray 650 to rotate the preset angle synchronously through the transmission unit. Since the tray 650 is also threadedly connected to the inner circumferential wall of the annular groove 410, the tray 650 also moves a preset distance along the axis of the tray 650 when rotating the preset angle synchronously. Since the rigid sealing ring 500 is relative to the tray 650, The abutment and rigid sealing ring 500 is also threadedly connected to the inner circumferential wall of the annular groove 410, so that multiple rigid sealing rings 500 simultaneously follow the tray 650 to rotate a preset angle and move a certain distance along the axis of the annular groove 410, so that the number of rigid sealing rings 500 in the annular groove 410 corresponding to the gate plate 200 increases by one, and the number of rigid sealing rings 500 in the annular groove 410 corresponding to the valve body 100 decreases by one, thereby allowing the outermost rigid sealing rings 500 of the two annular grooves 410 to be switched. Since the staff does not need to disassemble the valve body 100 during the replacement of the rigid sealing ring 500, the workload of the staff can be greatly reduced.

[0033] It should also be noted that in order to enable the tray 650 to drive the rigid sealing ring 500 to rotate synchronously, specifically, a synchronization groove 510 and a synchronization protrusion 520 can be respectively provided on the surfaces of the tray 650 and the rigid sealing ring 500 facing each other, so that under the transmission action of the synchronization groove 510 and the synchronization protrusion 520, the tray 650 can rotate synchronously with the rigid sealing ring 500 in contact with it.

[0034] In this embodiment, the transmission unit includes a synchronization rod and a synchronization hole. There are multiple synchronization rods, and the multiple synchronization rods are arranged at equal circumferential intervals on the end face of the tray 650 away from the rigid sealing ring 500. There are multiple synchronization holes, and the multiple synchronization holes are opened at equal circumferential intervals on the end face of the transmission gear ring 640 close to the mounting ring 400. The bottom of the mounting ring 400 is opened with multiple arc grooves 420, and the multiple arc grooves 420 correspond one-to-one to the multiple synchronization rods. The multiple synchronization rods slide through the corresponding arc grooves 420 and are inserted into the synchronization holes.

[0035] It can be understood that the synchronization rod and the synchronization hole are provided so that when the transmission gear ring 640 rotates around its own axis, the tray 650 can be driven to rotate synchronously through the transmission cooperation of the synchronization rod and the synchronization hole. The arc groove 420 is provided so that the synchronization rod can pass through the mounting ring 400 and be inserted into the synchronization hole.

[0036] In this embodiment, if Figure 2As shown, a pointer 611 is provided on the outer peripheral wall of the rotating disk 610, and a scale disk 120 is provided outside the valve body 100 and circumferentially of the rotating disk 610. A plurality of marking points are provided on the scale disk 120 at equal intervals. When the pointer 611 rotates from one of the marking points to another adjacent marking point following the rotating disk 610, it indicates that the distance moved by the rigid sealing ring 500 in the annular groove 410 is exactly equal to the thickness of one rigid sealing ring 500.

[0037] In the initial state, the pointer 611 is aligned with one of the marking points. When replacing the rigid sealing ring 500, the staff rotates the rotating disk 610 by a preset angle. At this time, the pointer 611 follows the rotating disk 610 to rotate synchronously by a preset angle. The pointer 611 rotates from pointing to the original marking point to pointing to another marking point adjacent to it. At this time, it means that the distance moved by the rigid sealing ring 500 in the ring groove 410 is exactly equal to the thickness of a rigid sealing ring 500. This makes it easy for the staff to accurately control the moving distance of the rigid sealing ring 500 in the ring groove 410, so as to accurately replace the rigid sealing ring 500.

[0038] In this embodiment, a soft sealing sheet and a hard sealing sheet are respectively embedded in the end faces of the rigid sealing ring 500, and the end faces of the two adjacent rigid sealing rings 500 facing each other are made of the same material type. Specifically, the soft sealing sheet can be a rubber sheet, and the hard sealing material can be a nickel-based alloy sheet or a hard alloy sheet.

[0039] When the gate valve is in use, if the fluid medium is changed (for example, when the pipeline is cleaned with strong acid or strong alkali), the rigid sealing ring 500 needs to be replaced so that the hard sealing piece is in direct contact with the fluid medium, thereby preventing the soft sealing piece from being corroded. Otherwise, the soft sealing piece is in direct contact with the fluid medium.

[0040] In this embodiment, both end faces of the rigid sealing ring 500 are inclined, and the inclination angle of the end face where the soft sealing piece is embedded is smaller than the inclination angle of the end face where the hard sealing piece is embedded.

[0041] Taking the temperature of the material flowing through the gate valve as room temperature as an example, the temperature of pickling and alkaline washing is higher than room temperature. Then, by making the inclination angle of the end face embedded with the hard sealing piece larger, it is beneficial to offset the geometric interference caused by thermal expansion by expanding the angle, while reducing the opening and closing energy consumption. By making the inclination angle of the end face embedded with the soft sealing piece smaller, it is beneficial to utilize the small angle to enhance the contact pressure of the sealing surface and improve the static sealing performance.

[0042] During the opening of the medium channel 110, the kinetic energy of the fluid medium flowing through the lower part of the rigid sealing ring 500 is greater than the kinetic energy of the fluid medium flowing through the upper part of the rigid sealing ring 500. Therefore, the wear of the lower part of the rigid sealing ring 500 is greater than the wear of the upper part of the rigid sealing ring 500. In order to solve this problem and make the wear of the rigid sealing ring 500 uniform in its circumferential direction, in this embodiment, a second drive assembly 700 is provided between the mounting ring 400 and the valve stem 300. The second drive assembly 700 is used to drive the mounting ring 400 to rotate around its own axis when the valve stem 300 rotates clockwise around its axis.

[0043] During use, at regular intervals, the staff uses the second drive assembly 700 to rotate the mounting ring 400 on the side wall of the gate plate 200 180 degrees around its own axis. Since the rigid sealing ring 500 is threadedly connected to the inside of the mounting ring 400, the rigid sealing ring 500 rotates synchronously with the mounting ring 400, so that the upper and lower parts of the rigid sealing ring 500 are swapped, that is, the original upper part becomes the lower part, and the original lower part becomes the upper part. In this way, the wear of the rigid sealing ring 500 in its circumferential direction can be made as uniform as possible, so as to extend the service life of the rigid sealing ring 500 and reduce the replacement frequency of the rigid sealing ring 500.

[0044] In this embodiment, if Figure 5 and Figure 13 As shown, the second drive assembly 700 includes an upper conical gear ring 710 and a lower conical gear ring 720. The upper conical gear ring 710 and the lower conical gear ring 720 are both sleeved on the outside of the valve stem 300. The upper conical gear ring 710 and the lower conical gear ring 720 are both matched with the valve stem 300 for one-way transmission, and are configured so that when the valve stem 300 rotates clockwise, the lower conical gear ring 720 rotates synchronously with the valve stem 300. When the valve stem 300 rotates counterclockwise, the lower conical gear ring 720 rotates relative to the valve stem 300. The upper conical gear ring 710 and the lower conical gear ring 720 are spaced apart from each other. The upper conical gear ring 710 is arranged in the gate plate 200. The upper conical gear ring 710 and the gate plate 200 can move synchronously along the axis of the valve stem 300, and the upper conical gear ring 710 is engaged with the annular conical gear groove on the inner circumference of the mounting ring 400 corresponding to the gate plate 200. The lower conical gear ring 720 is arranged at the lower part of the medium channel 110, and the lower conical gear ring 720 is engaged with the annular conical gear groove on the inner circumference of the mounting ring 400 corresponding to the valve body 100.

[0045] This embodiment is applicable to the second connection method between the valve stem 300 and the gate plate 200. When the medium channel 110 switches from a closed state to an open state, the staff rotates the valve stem 300 clockwise. At this time, the valve stem 300 drives the lower conical gear ring 720 and the upper conical gear ring 710 to rotate clockwise synchronously. At this time, the clockwise rotation of the lower conical gear ring 720 drives the mounting ring 400 corresponding to the valve body 100 to rotate around its own axis, and the clockwise rotation of the upper conical gear ring 710 drives the mounting ring 400 corresponding to the gate plate 200 to rotate around its own axis. In this way, the mounting ring 400 drives the rigid sealing ring 500 connected to its internal thread to rotate synchronously, thereby exchanging the upper and lower parts of the rigid sealing ring 500 so that the wear of the rigid sealing ring 500 in its circumferential direction is as uniform as possible.

[0046] It is understandable that the reason why the valve stem 300 and the upper conical gear ring 710 and the lower conical gear ring 720 are all in one-way transmission cooperation is to prevent the mounting ring 400 from rotating back to the original position after the medium channel 110 is closed.

[0047] It should also be noted that if Figure 7 and Figure 10 As shown, to prevent the upper bevel gear ring 710 from rotating when the valve stem 300 rotates counterclockwise, ratchet teeth are provided on the outer circumferential wall of the upper bevel gear ring 710, and a retaining groove 220 is provided on the gate plate 200. When the valve stem 300 rotates counterclockwise, the retaining groove 220 and the ratchet teeth engage with each other, so that the upper bevel gear ring 710 does not rotate counterclockwise synchronously with the valve stem 300. Similarly, ratchet teeth are also provided on the outer circumferential wall of the lower bevel gear ring 720, and a retaining groove 220 is also provided on the circumferential wall of the mounting groove for mounting the lower bevel gear ring 720. When the valve stem 300 rotates counterclockwise, the retaining groove 220 also engages with the ratchet teeth.

[0048] A leakage-proof gate valve uses the sealing assembly of the leakage-proof gate valve.

[0049] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A sealing assembly for a leak-proof gate valve, characterized in that: The anti-leakage gate valve comprises a valve body with a medium channel formed therein; A gate, slidingly disposed in the medium channel, for opening or closing the medium channel; The valve stem is connected to the valve body, with one end of the valve stem located outside the valve body and the other end located inside the medium channel. The end of the valve stem located in the medium channel is connected to the gate, and the valve stem can drive the gate to move along the axis of the valve stem; The sealing assembly comprises: There are two mounting rings, one of which is located inside the peripheral wall of the valve body and the other is located on the side wall of the gate. An annular groove is provided on the end surfaces of the two mounting rings facing each other. When the medium channel is closed, the two annular grooves enclose an annular closed chamber. There are multiple rigid sealing rings, which are stacked in sequence in the ring groove along the axis of the ring groove; The first drive assembly is arranged on the valve body, and is used to drive multiple rigid sealing rings to move synchronously along the axis of the ring groove; and when the two ring grooves enclose an annular closed chamber, the first drive assembly causes the rigid sealing rings in the ring groove to move sequentially along the axis of the slide groove.

2. The sealing assembly of a leakage-proof gate valve according to claim 1, characterized in that: The first drive assembly includes a rotating disk, a transmission rod, a transmission gear, a transmission gear ring and a tray. The transmission rod is rotatably arranged on the valve body, one end of the transmission rod is located outside the valve body, and the other end is located inside the valve body. The rotating disk is fixedly connected to the end of the transmission rod located outside the valve body. The transmission gear is located inside the valve body, and the transmission gear is coaxially arranged on the transmission rod. The transmission gear ring is rotatably arranged inside the valve body, the transmission gear ring is meshed with the transmission gear, and the transmission gear ring is coaxial with the mounting ring. The tray is threadedly connected to the innermost side of the ring groove, and the tray abuts against the innermost rigid sealing ring. The tray and the transmission gear ring are connected via a transmission unit, and the transmission unit is configured so that the tray and the transmission gear ring can rotate synchronously around the axis of the tray and move relatively along the axis of the tray.

3. The sealing assembly of a leakage-proof gate valve according to claim 2, characterized in that: The transmission unit includes a synchronization rod and a synchronization hole. There are multiple synchronization rods, which are circumferentially evenly spaced and arranged on the end surface of the tray away from the rigid sealing ring. There are multiple synchronization holes, which are circumferentially evenly spaced and opened on the end surface of the transmission gear ring close to the mounting ring. A plurality of arc grooves are formed on the bottom of the mounting ring, and the plurality of arc grooves correspond to the plurality of synchronization rods one by one. The plurality of synchronization rods slide through the corresponding arc grooves and are inserted into the synchronization holes.

4. The sealing assembly of a leakage-proof gate valve according to claim 2, characterized in that: The end surfaces at both ends of the rigid sealing ring are respectively embedded with a soft sealing sheet and a hard sealing sheet, and the end surfaces of two adjacent rigid sealing rings facing each other are made of the same material type.

5. The sealing assembly of a leakage-proof gate valve according to claim 2, characterized in that: The end faces of both ends of the rigid sealing ring are inclined, and the degree of inclination of the end faces of the rigid sealing ring increases from the inside to the outside along the axis of the ring groove.

6. The sealing assembly of a leakage-proof gate valve according to claim 2, characterized in that: A pointer is provided on the outer peripheral wall of the rotating disk, and a scale disk is provided outside the valve body and in the circumferential direction of the rotating disk.

7. The sealing assembly of a leakage-proof gate valve according to claim 2, characterized in that: A second drive assembly is provided between the mounting ring and the valve stem. The second drive assembly is used to drive the second drive assembly to rotate around its own axis when the valve stem rotates clockwise around its axis.

8. The sealing assembly of a leakage-proof gate valve according to claim 7, characterized in that: The second drive assembly includes an upper conical gear ring and a lower conical gear ring, both of which are sleeved on the outside of the valve stem. The upper conical gear ring and the lower conical gear ring are both matched with the valve stem for one-way transmission, and are configured so that when the valve stem rotates clockwise, the lower conical gear ring rotates synchronously with the valve stem, and when the valve stem rotates counterclockwise, the lower conical gear ring rotates relative to the valve stem; The upper conical gear ring and the lower conical gear ring are spaced apart from each other, and the upper conical gear ring is arranged in the gate plate. The upper conical gear ring and the gate plate can move synchronously along the axis of the valve stem, and the upper conical gear ring is engaged with the annular conical gear groove on the inner circumference of the mounting ring corresponding to the gate plate. The lower conical gear ring is arranged at the lower part of the medium channel, and the lower conical gear ring is engaged with the annular conical gear groove on the inner circumference of the mounting ring corresponding to the valve body.

9. The sealing assembly of a leakage-proof gate valve according to claim 1, characterized in that: The gate plate and the valve stem are threadedly connected, and a guide block is provided on the side of the gate plate. A guide groove is opened in the medium channel, and the guide groove extends along the axis of the valve stem. The guide groove and the guide block are slidably matched.

10. A leak-proof gate valve, characterized in that: A sealing assembly for a leakage-proof gate valve according to any one of claims 1 to 9 is used.

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